CN104628153A - Water desalination station regeneration wastewater zero-discharge technology - Google Patents
Water desalination station regeneration wastewater zero-discharge technology Download PDFInfo
- Publication number
- CN104628153A CN104628153A CN201310550029.2A CN201310550029A CN104628153A CN 104628153 A CN104628153 A CN 104628153A CN 201310550029 A CN201310550029 A CN 201310550029A CN 104628153 A CN104628153 A CN 104628153A
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- CN
- China
- Prior art keywords
- pond
- technology according
- calcium
- demagging
- settling agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a method for reducing the total hardness of water desalination station regeneration wastewater, recycling the wastewater, and producing byproducts (magnesium hydroxide, calcium sulfate, and calcium carbonate). In the provided method, lime milk, a soluble carbonate solution, and a settling agent (polyacrylamide) are added into water desalination station regeneration wastewater so as to precipitate calcium ions and magnesium ions respectively, and thus the calcium and magnesium can be recycled. After the treatment, the total hardness of the effluent is lower than 300 mg/L, the investment is little, the operation cost is low, no sewage or industrial solid waste is generated during the treatment course, and the comprehensive utilization of resources is completely achieved.
Description
Art
The present invention relates to the method for a kind of Desultwater Station regenerative wastewater process, specifically calcium, magnesium ion concentration in a kind of reduction de-salted water regenerative wastewater, recycle the waste water after process and the method for coproduct hydrogen magnesium oxide, calcium sulfate and calcium carbonate.
Background technology
Along with expanding economy and social progress, de-salted water application is in the industrial production very general.Its production technology mainly contains ion-exchange, membrane sepn, evaporation etc., no matter which kind of production method, capital inevitably produces a large amount of saline sewage, and total hardness is more than 5000 mg/litre, current processing mode mostly through simply neutralizing, outer row after precipitation process, or be back to by the extremely low operating mode of water water quality requirement, the mud impurity that this processing mode produces is too much, can only store up as general industry solid waste, increase extra production cost.
Summary of the invention
For solving above-mentioned background technical problem, the invention provides the technique of a kind of Desultwater Station regenerative wastewater zero-discharge technology coproduct hydrogen magnesium oxide, calcium sulfate and calcium carbonate, directly Desultwater Station regenerative wastewater through and adding milk of lime, soluble carbonate salt solution and settling agent, removing calcium, magnesium ion, reduce sewage total hardness, then recycle after adjusting water outlet pH value.Desultwater Station regenerative wastewater after process of the present invention, its total hardness can be down to below 300mg/L (with CaCO
3meter), circulating water system make up water, desulphurization system doctor solution make up water, directly or indirectly water coolant, ground flushing water etc. can be back to, realize the zero release of Desultwater Station regenerative wastewater.Reclaim the magnesium hydroxide of generation, calcium sulfate and calcium carbonate simultaneously, can be used as the fire retardant of the macromolecular materials such as the sweetening agent of tail gas desulfurization, plastics, stopping composition or other purposes, achieve the recovery comprehensive utilization of sewage and Industrial Solid Waste, while obtaining good economic benefits, also achieve good social benefit, really embody energy-saving and emission-reduction and circular economy concept.
Accompanying drawing explanation
Figure of description is present invention process flow diagram.Wherein: 1 is demagging pond, and 2 is preliminary sedimentation tank, 3 is deliming pond, and 4 is second pond, and 5 is middle pond, 6 is demagging pond stirrer, and 7 is deliming pond stirrer, and 8 is milk of lime, and 9 is polyacrylamide, and 10 is magnesium hydroxide, 11 is calcium sulfate, and 12 is carbonate solution, and 13 is polyacrylamide, and 14 is calcium carbonate.
Embodiment
Be described further for the double chambers and double layer fixed bed cation interchanger regenerative wastewater of ion exchange method below: ion exchange method regenerating cation exchanger operation is backwash, regeneration, displacement, just wash four steps, wherein backwash, just wash and can directly reclaim with aliquot replacement waste water, regenerative wastewater and aliquot replacement waste water are discharged as sewage, use sulfuric acid as regenerator, divide and progressively improve sour dense cyclic regeneration for three times.Regenerative wastewater is mainly containing Ca
2+, Mg
2+, K
+, Na
+, SO
4 2-deng, wherein Ca
2+, Mg
2+excessive concentration, is in saturated or even hypersaturated state in waste water, if do not removed, directly causes regenerative wastewater reuse limited.This technology is undertaken by following two steps: 1, Desultwater Station regenerative wastewater is entered demagging pond, adds appropriate milk of lime and settling agent polyacrylamide and stirs, make Mg in demagging pond
2+with OH
-reaction generates Mg (OH)
2precipitation, Ca
2+with SO
4 2-reaction generates CaSO
4enter preliminary sedimentation tank after precipitation, treat Mg (OH)
2and CaSO
4reclaim the mixture of magnesium hydroxide and calcium sulfate after sedimentation, can be down to below 2500mg/L through demagging processed waste water total hardness, reaction equation is: Mg
2++ Ca (OH)
2=Mg (OH)
2↓+Ca
2+, Ca
2++ SO
4 2-=CaSO
4↓; 2, the waste water after demagging come from preliminary sedimentation tank is entered deliming pond, in deliming pond, add soluble carbonate salt solution and settling agent polyacrylamide and stir, making Ca
2+with CO
3 2-reaction generates CaCO
3enter second pond after precipitation, treat CaCO
3reclaim after sedimentation, from second pond come waste water enter middle pond, regulate reuse after pH value, the clear water total hardness reclaimed after removing Calcium treatment can be down to below 300mg/L.Reaction equation is: Ca
2++ CO
3 2-=CaCO
3↓.Treatment process as shown in Figure of description, uses milk of lime as demagging agent, uses sodium carbonate as calcium remover, processes from interchanger regenerative wastewater double chambers and double layer fixed bed is positive, treating processes and process afterwards parameter as following table:
If use volatile salt as calcium remover, then can obtain the ammoniumsulphate soln that concentration is 1.55% in the waste water reclaimed, as ammonium method desulfurization make up water, then ammonium sulfate can obtain total integration utilization, and solves the moisturizing problem of doctor solution well.As seen from the above, this technical matters is simple, and investment cost is few, and running cost is low, can realize the recycling completely of waste water and solid waste, is more satisfactory Desultwater Station regenerative wastewater treatment technology.
Claims (10)
1. a Desultwater Station regenerative wastewater zero-discharge technology, it is characterized in that, the present invention carries out in the steps below: Desultwater Station regenerative wastewater is entered demagging pond, add milk of lime and settling agent polyacrylamide and enter the mixture that preliminary sedimentation tank reclaims magnesium hydroxide and calcium sulfate after stirring, the waste water come from preliminary sedimentation tank enters deliming pond, add soluble carbonate salt solution and settling agent polyacrylamide and enter second pond after stirring and reclaim calcium carbonate, then in being sent into by waste water, pond regulates reuse after pH value.
2. technology according to claim 1, it is characterized in that adding milk of lime in demagging pond, reaction equation is Mg
2++ Ca (OH)
2=Mg (OH)
2↓+Ca
2+ca
2++ SO
4 2-=CaSO
4↓.
3. technology according to claim 1, is characterized in that adding settling agent polyacrylamide in demagging pond.
4. technology according to claim 1, is characterized in that stirring in demagging pond.
5. technology according to claim 1, is characterized in that the mixture reclaiming magnesium hydroxide and calcium sulfate in preliminary sedimentation tank.
6. technology according to claim 1, is characterized in that adding settling agent polyacrylamide in deliming pond.
7. technology according to claim 1, it is characterized in that adding soluble carbonate salt solution in deliming pond, reaction equation is: Ca
2++ CO
3 2-=CaCO
3↓.
8. technology according to claim 1, is characterized in that stirring in deliming pond.
9. technology according to claim 1, is characterized in that reclaiming the calcium carbonate in second pond.
10. technology according to claim 1, water in after it is characterized in that regulating pH value also to recycle in middle pond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310550029.2A CN104628153A (en) | 2013-11-08 | 2013-11-08 | Water desalination station regeneration wastewater zero-discharge technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310550029.2A CN104628153A (en) | 2013-11-08 | 2013-11-08 | Water desalination station regeneration wastewater zero-discharge technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104628153A true CN104628153A (en) | 2015-05-20 |
Family
ID=53207461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310550029.2A Pending CN104628153A (en) | 2013-11-08 | 2013-11-08 | Water desalination station regeneration wastewater zero-discharge technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104628153A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592163A (en) * | 2020-05-28 | 2020-08-28 | 山东建筑大学 | Desulfurization wastewater zero-discharge treatment system and treatment method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522974A (en) * | 2003-09-11 | 2004-08-25 | 浙江大学 | By-pass flow process for treating industrial cyclic cooling water |
| CN102838155A (en) * | 2012-09-28 | 2012-12-26 | 湖南文理学院 | Causticizing method and process device for preparing precipitated calcium carbonate by recycling papermaking alkali |
| CN102849879A (en) * | 2012-10-11 | 2013-01-02 | 北京机电院高技术股份有限公司 | Treatment technology for recycling reverse osmosis concentrated water |
| CN103214077A (en) * | 2013-04-26 | 2013-07-24 | 何京明 | Preparation method of byproduct high-purity calcium sulphate by deep purification of nitrate aqueous solution |
| CN203269687U (en) * | 2013-03-25 | 2013-11-06 | 上海华强环保设备工程有限公司 | Oily grinding wastewater purification treatment equipment in production of bearings |
-
2013
- 2013-11-08 CN CN201310550029.2A patent/CN104628153A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522974A (en) * | 2003-09-11 | 2004-08-25 | 浙江大学 | By-pass flow process for treating industrial cyclic cooling water |
| CN102838155A (en) * | 2012-09-28 | 2012-12-26 | 湖南文理学院 | Causticizing method and process device for preparing precipitated calcium carbonate by recycling papermaking alkali |
| CN103303956A (en) * | 2012-09-28 | 2013-09-18 | 湖南文理学院 | Causticizing method and process device for recycling papermaking alkali to prepare precipitated calcium carbonate |
| CN102849879A (en) * | 2012-10-11 | 2013-01-02 | 北京机电院高技术股份有限公司 | Treatment technology for recycling reverse osmosis concentrated water |
| CN203269687U (en) * | 2013-03-25 | 2013-11-06 | 上海华强环保设备工程有限公司 | Oily grinding wastewater purification treatment equipment in production of bearings |
| CN103214077A (en) * | 2013-04-26 | 2013-07-24 | 何京明 | Preparation method of byproduct high-purity calcium sulphate by deep purification of nitrate aqueous solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592163A (en) * | 2020-05-28 | 2020-08-28 | 山东建筑大学 | Desulfurization wastewater zero-discharge treatment system and treatment method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |